Reamer



Feb. 6, 1940. M. D. CARLETON 'IMI F-TE 6 Patented Feb. 6, 1940 REAMER W Michael D. Carleton, Houston, Tex., assignor to Reed Roller Bit Com corporation of Texas pany, Houston, Tex., in

Application December 8, 1938', Serial No. 244,545

2 Claims.

This invention relates to reamers for use in connection with the drilling of wells. It has for its general object the provision of a structure whereby a reamer cutter of the roller type may befirmly and rigidly mounted within a recess in a reamer body.

In mounting reamer cutters within their recesses, it is desirable that they be mounted as firmly as possible and it is desirable thatthere 19 be no possibility of play between any of the parts constituting the mounting during the operation of the reamer.

It is, therefore, an object of this invention to provide a structure for mounting a reamer cutter in a recess in the side of a reamer body in such a. manner as to give the greatest possible degree of rigidity to'the mounting, prevent any lost motion between the parts of the mounting during the operation of the reamer, and at the same time utilize the smallest possible number of parts and eliminate any parts which might easily be broken or distorted.

It is a further object to provide a structure in which parts are not welded or similarly joined together.

Itisa further object to provide a structure in which the reamer cutter may be readily removed and replaced without necessity for skillful adjustment or for the use of extraordinary or special tools.

Another object of this invention is to provide a unitary assembly consisting of a reamer cut- I ter and means for mounting it within a cutter body, which assembly may be fitted together and delivered to the customer to be mounted, dismounted and replaced as a unit.

Another object of this invention is to provide a simple and useable locking device for holding a reamer cutter assembly in place on a reamer body.

Another object of this invention is to provide positive means for taking the end thrust from a reamerfcutter.

One other object of this invention is to provide a simple locking device for areamer cutter assembly which will prevent rocking or other lateral movement of the assembly with respect to the cutter body.

Other objects and advantages will become apparent, from the following description, taken in connection with the accompanying drawing, it being understood that the same are by way of illustration and example only.

' In the. drawing:

Fig. 1 is a side elevation of a reamer body constructed in accordance with this invention showing the reamer cutters in place therein.

Fig. 2 is a vertical cross section through one wall of the reamer body illustrated in Fig. 1 and through one of the cutters mounted therein, the

same being taken along the line 2-2 of Fig. 1.

Fig. 3 is a partial horizontal cross section taken along the line 3-3 of Fig. 2.

Fig. 4 is a partial horizontal cross section taken along the line 4-401 Fig. 2

Fig. 5 is a horizontal cross section taken along the line 55 of Fig. 1.

Fig. 6 is a horizontal cross section taken along the line 6-6 of Fig. 2.

In accordance with this invention, a reamer body -I is formed with a major recess 2 intermediate its ends and with auxiliary recesses 3 and 4, respectively, at the opposite ends of the major recess and opening thereinto. These auxiliary recesses are formed with substantially parallel side walls 5 and with inner walls 6 which are inclined with respect to the side walls and with re: spect to each other, the effect of these inner walls being to provide with the side walls 5 a trough having a substantially V-shaped bottom portion and parallel side portions. The bottom of this trough, however, is open and communicates with the upper end 1 of an inverted T-slot 8. These auxiliary recesses and the T-slots 8 open into the adjacent ends of the major recess 2.

For the purpose of forming abutments for the opposite ends of the cutter assembly, there are welded into the auxiliary recesses 3 and 4, respectively, abutment blocks 9 and I0, these blocks being backed up, respectively, by welding material II and I2. The adjacent surfaces of these abutment blocks 9 and III are spaced from each other by exactly the overall length of the cutter assembly.

The cutter assembly consists of the cutter l3 rotatably carried upon the pin l4 and having a block I 5 integral with one'end of the pin and a block I 6 rotatably secured to the end of the pin. The block l6 may be secured to the pin by any suitable means, a dowel ll being illustrated in the drawing. The opposite ends of the blocks l5 and I6 inthis assembly define the overall length of the cutter assembly and are adapted to fit snugly between the abutments 9 and I0.

Before the assembly just referred to is placed in position in a meaner body, a pair of bolts l8 and [9 having enlarged heads 20 and 2| are placed in the T-slots8. These heads 20 and 2| are preferably non-circular so that the bolts will not rotate within the T-slots. The blocks l5 and I6 are provided with holes adapted to receive the bolts [9 and I8, respectively, and nuts-22 and 23 are threaded onto the outer ends of these bolts to hold the blocks l5 and H3 in their proper position within the auxiliary recesses 3 and 4. It will be noted that as the nuts 23 and 22 are tightened, the respective blocks will not only be secured firmly within the auxiliary recesses, but will beheld tightly against the oppositely inclined lower Walls 6*of these recesses and thus positively prevented from having any lateral movement. Any longitudinal movement of the assembly is prevented by virtue of the engagement of the blocks 9 and I0 with the blocks l6 and I5,

respectively.

It will be appreciated from the foregoing that the assembly consisting of the cutter, the pin upon which it is rotatablycarried and the two blocks mounted on the ends of the pin can be made up as an assembly in the factory and sent out to be kept in stock or upon request for the purpose of replacement of a cutter assembly in the reamer set forth. This makes it possible to remove and readily replace worn or damaged reamer cutters because all thatis necessary to replace the cutters of a reamer and to place the reamer in as good condition as new is to remove the two nuts 22 and 23 and lift out the cutterassembly, replace it with a new cutter assembly, put the nuts 22 and 23 back in place and tighten them with an ordinary wrench. The operation is very simple and can be performed by anyone without training and without special tools. The time required should be not more than a very few minutes and practically all de-. lay due to damaged reamer cutters can be eliminated. At the same time, when the assembly is in place, it is positively held against endwise movement by the abutment blocks 9 and I0 and is held against lateral movement by the wedging engagement between the blocks l5 and I6 and the oppositely inclined lower walls 6 of the auxiliary recesses.

It will thus be seen that a means has been,

provided for carrying out all the objects and advantages sought by this invention.

Having described my invention, I claim:

1. In a reamer construction, a reamer body 1 blocks each having an opening to receive one,

of said bolts and adapted to be disposed. in one of said auxiliary recesses, each of said blocks having a pair of inclined surfaces adapted to engage said inclinedv inner walls of the auxiliary recesses, respectively, a cutter pin extending from one of said blocks toward the other of said blocks and secured within an opening at the other of said blocks, a reamer, cutter rotatably mounted,

upon said pin. between said blocks and adaptedto lie within said major recess, and a pair of.

nuts engaging said bolts and bearing against. said blocks to secure said blocks tightly. Within said auxiliary recesses.

2. In a reamer construction, a reamer body having a major recess, a pair of auxiliary re cesses at opposite ends of said major recess, and

an inverted T-slot opening into the lower portion.

of'each of said auxiliary recesses, a reamer cutter adapted to be rotatably mounted in said major recess, a pair of blocks. adapted tofbe mounted in said auxiliary recesses, respectively,

tending into said major recess to rotatably mount said cutter, and a bolt having a head slidably engaged in each of said T-slots' and a nut on the bolt engaging the outer face of each of said blocks, for holding saidblocks and cutter inassembled relation with respect to said body.

MICHAEL D.

bearing means carried by said blocks and ext 

